Concrete block



FIG. 1 is a top rear perspective view of a concrete block in accord with my design;

FIG. 2 is a bottom rear perspective view thereof;

FIG. 3 is a side elevational view thereof, the opposite side being the mirror image thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a rear end elevational view thereof; and,

FIG. 7 is a front end elevational view thereof. 

CLAIM The ornamental design for a concrete block. 